*{
    padding: 0;
    margin: 0;
    
}


.grayBox{
    height: 200px;
    width: 400px;
    background-color: #ccc;
    position: absolute;
    top:50%;
    margin-top:-100px;
    left: 50%;
    margin-left:-200px;  
    overflow:hidden; 
    &::after{
        content: "";
        display: block;
        width: 100px;
        height: 100px;
        background-color: #fc0;
        border-radius: 50%;
        position: absolute;
        top: -50px;
        left: -50px;
    }
    &::before{
          content: "";
        display: block;
        width: 100px;
        height: 100px;
        background-color: #fc0;
        border-radius: 50%;
        position: absolute;
        bottom: -50px;
        right: -50px;
    }
}
